DTC P0300 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
z
Has FREEZE FRAME DATA been
recorded?
Yes Go to the next step.
No
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
and/or on-line repair information
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to the
available Service Bulletins.
z
If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE
OR STORED DTCs
z
Turn the ignition switch off then to
the ON position (Engine off).
z
Verify related pending code or stored
DTCs.
z
Are other DTCs present?
Yes Go to the appropriate DTC troubleshooting. (See
DTC TABLE [MZI-3.7]
.)
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL
STATUS (KEY TO ON/IDLE)
z
Access APP1, APP2, APP3, ECT,
IAT, MAF, RPM, TP_REL and VSS
PIDs using the M-MDS. (See
PCM
INSPECTION [MZI-3.7]
.)
z
Is there any signal that is far out of
specification when the ignition
switch is in the ON position and
engine runs at idle?
Yes
Inspect the suspected circuit or part or both
according to inspection results.
(See
PCM INSPECTION [MZI-3.7]
.)
Then go to Step 18.
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL
STATUS UNDER TROUBLE
CONDITION
z
Inspect the same PIDs as in Step 4
when simulating the FREEZE
FRAME DATA condition.
z
Is there any signal which causes
drastic changes?
Yes
Inspect the suspected circuit or part or both
according to inspection results.
(See
PCM INSPECTION [MZI-3.7]
.)
Then go to Step 18.
No
Go to the next step.
Inspect the installation condition for damage to
the timing belt and gears, and repair
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:36 AM
Page 152
© 2005 Mitchell Repair Information Company, LLC.
